Module: Mongo::DynamicFinders

Defined in:
lib/mongo/driver/dynamic_finders.rb

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(clause, *args, &block) ⇒ Object (protected)

Dynamic finders, like ‘first_by_field`, `all_by_field`, `each_by_field`, `first_by_field`.



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# File 'lib/mongo/driver/dynamic_finders.rb', line 4

def method_missing clause, *args, &block
  if clause =~ /^([a-z]_by_[a-z_])|(by_[a-z_])/
    clause = clause.to_s

    bang = clause =~ /!$/
    clause = clause[0..-2] if bang

    finder, field = if clause =~ /^by_/
      ['first', clause.sub(/by_/, '')]
    else
      clause.split(/_by_/, 2)
    end

    finder = 'first' if finder == 'find'
    field = '_id'    if field  == 'id'

    if bang
      raise "You can't use bang version with :#{finder}!" unless finder == 'first'
      finder = "#{finder}!"
    end

    raise "invalid arguments for finder (#{args})!" unless args.size == 1
    field_value = args.first

    finder, field = finder.to_sym, field.to_sym

    if respond_to? finder
      send finder, {field => field_value}, &block
    else
      super
    end
  else
    super
  end
end